Skiving-machine.



J. S. TURNER.

SKIVING MACHINE.

APPLICATION FILED AUG. 22, 1909.

Patented May 18, 1909.

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J. s. TURNER. SKIVIN G MACHINE.

APPLICATION FILED AUG. 22, 1908.

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Patented May 18, 1909.

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To all whom it may cmwem:

Be it known that T, din-Mas S. Tonnes, of Lowell, in the county of Middlesex and State of Massaehuetts, have invented certain new and useful Improvements in .Skiving- Machines, of which the'foliowing is a specification.

This invention relates to machines for skiving the ends of strips of leather used 01 machine belting and other purposes, the skived ends being adapted to be brought together to form a lap oint, the thickness of which does not exceed the average thickness of the strip.

The invention has for its object to provide a machine adapted to scari or skive a piece of leather quickly and accurately, without requiring the services of a skilled operator.

The invention consists in the improvements which I will now proceed to describe and claim.

0f the accompanying drawings forming a part of this sipecificatiom-Figure 1 repre sents a side elevation of a skiving machine embodying my im'ention. Fig. 2 represents a longitudinal section of the same, t e parts being in the position shown in Fig. 1. Fig. 3 represents a side elevation, showing the machine at a difierent stage of the operation. ,Fig. 4 represents a longitudinal section, showin the machine in the condition represented in Fig.3. Fig. 5 represents a section on the line 55 of F 1g. 1. Fi 6 represents a section on the line 6-6 of l ig. 3. Fig. 7 represents a section on the line 77 of Fig. 4.

The same reference characters indicate the same parts in all the figures.

The sup orting trame of the machine is provided with horizontal guides 12 on Which a carrier 13 is mounted to reciprocate in a horizontal path.

it represents a skiving knife afiixed to the carrier 13.

15 represents a worksupporting bed which is supported in'an inclined position relatively to the path of the knife and is adapted to support a piece of work such as a strip 16 of belting leather, and hold said strip in an inclined position in the path of the knife, so that the knife in moving'forward will skive off one end of the strip, as illustrated in Fig. 2. The carrier is provided with a resser-foot 17 which is tends across the bed 15 at a proximity to the edge of the knife 14:. The presser-t'oot is preferably a bar extending norms the bed 15, the ends of the bar projecting into slots 18 in standards 19 formed on or afiixed to the carrier 13. Springs 20, located in said slots, exert a downward ressnre on' said resser-foot and hold it yieldingly on the work on the bed 15.

21 represents a clamping bar which expoint behind the knife and is adapted to hold the stri '16 firmly against the bed, the ends of sai bur prog'ecting into slots 22 in standards 23 attixed to the frame of the machine. The clamping bar 21 is normally raised from the bed by springs 24 and may be depressed by eccentrics 25 aflixed to a rockshaft 26, which is j ournaled in hearings in the standard 23, and is provided with an operating lever 27.

The Work-supporting bed 15 is adapted to be moved sidewise toward and from the knife, mechanism being provided for automatically raislng or mov ng the bed toward the knife prior to the skiving operation, and

thus pressing the upper side of the strip closely against the under side of the knife to insure the uniform action of the cutting edge entirely across the strip, so that the skived portion will have a clearly defined end extending across the strip at right angles to the length of the latter, the bed being rigidly supported inits raised position. The said mechanism is organized to move the bed downwardly away from the knife at the end of the skiving operation, thus permitting the removal of the skived strip and the insertion of another strip. The bed 15 rests upon what I may term an adjustable base,

which is adapted to rigidly su port the bed in an inclined position relative y to the path of the knife, and to raise and lower the bed for the purposes above stated. The said base, in this embodiment of the invention, includes two swinging bars 28 pivoted at 29 to the frame of the machine, an outer supporting member 30 having eccentric trunuions 31 at its ends which are journaled in sockets in the swinging ends of the bars 28, and an inner supporting member 32 having eccentric trunnions 33 at its ends which are journaled in fixed bearings in the frame of the machine. The supporting members 30 and -32 extend across the bed'15 below the same, and are of cylindrical form. The

outer member 30 is supported by a fixed part 31 of the frame. Owing to the eccentric arrangement ofsaid member relatively toits trunnions 31, a partial rotation of the member. will cause it to either raise or depress the swinging ends of the bars 28. The inner'member 32, being journaled in fixed bearings and also eccentricallyarranged relatively to its trunnions, is raised or depressed by a artial rotation. When the members 30 and 32 are adjusted as shown in Fig. 2, the swinging ends of the bars 28 are raised, so that afoot 34 on the underside of the bed 15 bears upon said bars, as shown in Fig. 2. Another partof the bed 15 at the same time bears upon the inner member 32,

the bed being thus rigidly supported in its raised position. When the members 30 and 32 are turned to the position shown in Fig.

4, the bars 28 and the member 32 are de-' pressed and support the bed 15 in its lowest position. Means are provided for turning the members'3O and 32 from each of the described positions to the other, said means shaped face 43 and with a face 44 which is withdraw the concentric face 44 from con tact with the trundle roll 46, as shown in Fig. 4, the arm 39 at'the same time act ng concentric to the fulcrum 36.

45 represents an arm whichis afiixed one of the t-runnions 31 of the outer member 30, and is provided at its outer end with a trundle roll 46 which is arranged to bear on I the faces 43 and 44 of the arm 38. The arm, 39 has a forked -outer and through which passes a rod 47 having collars 48 and 49 and pivoted at 50 to an arm 51 which is aiiixed to one of the trunnions 33 of the inner member 32. Buffer springs 52 are interposed be-- tween the arm 39 and the collars-48 and 49.

when the lever 35 is in the position shown in Fig. 1, the trundle roll 46 bears on the concentric face 44, the outer member 30 being thus held or locked in the position shown in Fig. 2. When the-lever 35' is moved to Fig. 3, the weight of the bed 15 and the bars 28 causes the member 30 to turn from the positionshown in Fig. 2 to that shown in through one of the springs 52, and the rod 4 to turn the inner member32 from the tion shown in Fig. 2 tothat shown in Fig. 4. The arm 45 isnow in position to be engaged 'by the cam-face 43 during the return movement of the lever 35 from the position shown in Fig. 3 to that shown in Fi 1, said came face acting on the trundle r01 46 and movosishaft 42.

ing the arm 45 in the direction required to turn the outer member 30 to the position vjust before the forward movement of the carriage, the bed being depressed after the knife has completed its forward movement. The position of the bed 15, when it is raised, is such that the knife, in making its forward movement, passes entirely through the strip 16 and reduces the same to a thin edge at its forward end.

The angle of inclination of the bed 15 may be "aried by moving thebed endwise when the bars 28 are supported in their raised position, as shown in Fig. 2, the bars being then inclined so that an endwise movement of-the' bed in one'direction will 'cause the foot 34 to move upwardly, while an endwise movement of the bed in the opposite direction will cause the foot 34 to move downwardly.

55 represents an adjusting screw which is engaged with a threadedorifi'ce in a fixed car 56, the said screw ,being engaged with an arm 57 attached to one end of the bed 15. The rotation'of the screw 55 causes an endwise adjustment of the bed.

To prevent the inner member 32 from being displaced from its raised position by the weight of the bed, I provide means forlocking said-member, said means including a ratchet 58 aflixed to one of the trunnions 33, and a pawl 59 pivoted at 60 to the frame of the machine and adapted to engage the ratchet. A short lever 61, pivoted at 62 to the frame of the machine, is connected at one end to the pawl by a rod 63 and at the other end with the carrier 13 by a rod 64, the lastnamed rod having a frictional engagement with the carrier, so that, when resistance is Y offered to the movement of the rod 64, the

carrier may move independently of said rod. The arrangement of the described parts s such that when the inner member 32 is moved to its raised position, the pawl 59v gagement from the ratchet 58 as indicated in Fig. 3. 1 The crank shaft '42 may be driven by power applied in any suitable way. Ihave gearing connecting said shaft with thefcrank here shown a driving shaft 65. and a train of p eaaaie the lever 35 and the arm 51, the yielding nature of this connection enabling the elevation of the inner member 32, caused by the upward movement of the rod47 and arm 51, to cease when the strip 16 comes in contact with the knife 14, the elevation of the inner member being less when the strip is relatively thick than when it is relativelythin. Provision. is therefore made for pressing a strip of any thickness againstthe knife, the elevation of the member 32 and of the portion of the bed 15 resting upon it'being' determined by the thickness of the strip. The yielding connection between the carrier 13 and the rod (34; etfected by means of a sleeve 66 attached to the carrier and having a frictional engagement. with the rod,enables the pawl 59 to engage the ratchet 58 in any position to which the latter may be turned so that the member 32 is locked atany height to which it may be raised.

I claim:

1. A skiving machine comprising a reciprocating skiving knife, a work-supporting bed which is inclined relatively to the path of the knife and is movable bodily toward and from said path, and automatic mechanism for moving the bed, said mechanism having provisions for moving the bed toward the knife before the cutting movement thereof, rigidly supporting the bed during said cutting movement, and moving the bed away from the knife aftersaid cutting movement.

2. A skiving machine comprising a reciprocating skiving knife, an adjustable supporting base located below the path of the knife, a work-supporting bed mounted on said base, the latter being arranged to hold the bed at an inclination relatively to the path of the knife, and automatic mechanism for adjusting the base to move the bed toward and from the knife.- 1

3. A skiving machine comprising a movable skiving knife, an adjustable supporting base located below the path of the knife, a work-supporting bed held by said base at an inclination relatively to the, path of the knife, mechanism for reciprocating the knife, and connections between said mechanism and the supporting base whereby the latter is automatically adjusted to move the bed toward and from the knife.

at. A skiving machine comprising a reciprocating skiving knife, an adjustable supporting base located below the path of the knife, a. work-supporting bed slidingly mounted on said base and held thereby at an inclination to the path of the knife, and

means foradjusting the bed endwise, the:

said base having provisions for causin a variation in the inclination of the bed w on the latter is moved endwise.

5. A ,skiving machine comprising a reciprocating skiving knife, an adjustable sup- 'eccentricallly porting base including a pair of pivoted bars, inner and outer transverse sup ort-ing members, one eccentrically journaled in the swinging ends of said bars, and the other eccentricall journaled in fixed bearings, and a-fived support for theouter member, an inclined work-supporting bed bearing on said bars and on the inner supporting memher, and means for turning said supporting members to raise and lower the bed.

6. A skiving machine comprising a reciprocating skivmg knife, an adjustable sup-' porting base including a pair of pivoted bars, inner and outer transverse sup ortmg members, one eccentrically journale in the swinging ends of said bars, and the other journaled in fixed bearings, and a fixe support for the outer member, an inclined work-supporting bed bearing on said bars and on the inner supporting memher, arms afiixeol to the supporting members, a base adjusting lever having a cam face and a concentric. face adapted to alternately engagethe arm on the outer member, a rod yieldingly engaged with said lever and pivoted to the arm on the inner member and means for oscillatin the adjusting lever.

7. A skiving mac ine comprising a recip-' rocating skivmg knife, an adjustable supporting base including a pair of pivoted bars, inner and outer transverse supporting members, one ecccntrically journaled in the swinging ends of said bars, and the other locking the inner member when the bed is raised.

8. A skiving machine com IlSlIlg a reciprocating carrierhaving a skiving knife, an

adjustable supporting base including inner and outer eccentrically mounted supporting members, a work-supporting bed resting in an inclined position on said base, means for turning said members to raise and lower the bed, a'ratchet affixed to the inner member, av pawl adapted to engage said ratchet and lock the inner member and connectionsbetween said pawl and the carrier whereby the pawl is moved t'o and from ts operative position.

9. A skivlng machine comprising a reciprocatory skivmg knife, an adjustable supporting base includin a supporting member eccentrically j ournale in fixed bearings and adapted to be elevated and depressed by a partial rotation, a bed supported in an inclined position by said base and resting on the supporting member, and means for yieldingly elevating said supporting memher, so that the elevation of the supporting member and bed is determined by the thickevating said supporting member, so I that-the elevation of the sup orting member and bed is determined byt e thickness of 'the work,'and means for locking the sunporting'member in any position to which 1t 15 may be elevated.

In testimony whereof I have affixed my signature, in presence of two witnesses.

JAMES S. TURNER. I

Witnesses:

i G. F. BROWN,

E. BA'rcnELoEn. 

